Use of Mushroom Spent Wheat Straw Compost as Animal Feed

摘要

Spent compost wheat straw (SPWS) is an available by-product, remaining from edible mushroom production, in a considerable amount, that creates an environmental problem and, economically, disposal of this mass residue will increase the mushroom production cost. This experiment was conducted to use SPWS from Agaricus bisporus mushroom, obtained from Sina mushroom production units, (Hamedan, Iran). In a completely randomised design, twenty five male lambs, with initial weight of 29 ± 1.14 kg were allocated to five experimental diets contained 0,5,10,15 and 20 percent SPWS, respectively. During the 100 days experiment, daily voluntary feed intake was individually recorded and daily gain was determined by dividing the amount of body weight gain obtained from two consequently weighing into days of weighing interval. Feed conversion ratio was estimated, dividing the dry matter intake into body weight gain. At the end of the experiment, two lambs from each treatment were slaughtered and the internal organs were controlled and compared visually. The final live weight of the lambs receiving diets 1-5 were 46.1, 45.8,48.4, 42.9 and 46.9 kg and the average daily gains were 178, 194, 213, 156 and 196 g per animal respectively, which were not significantly (P > 0.05) varied among the treatments. The average daily dry matter intakes per animal were 1253,1390, 1424,1268 and 1175 g for the diets 1-5 respectively, and were significantly different. Feed conversion ratios were 7.19,7.34, 6. 9,7.33 and 5.96 for the diets 1-5, which were not statistically different among the treatments. No differences were observed in organs and carcasses of the lambs receiving the different diets. It can be concluded that SPWS separated from casing soil may be used up to 20% in the diet of finishing lambs.